GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

DEFINITION: A loud bang or thump that can usually be felt and/or heard when the vehicle is driven over bumps. This condition is commonly noticed when the vehicle trim height is too low.

1

Road test the vehicle in order to verify the customer complaint. Ensure that the customer complaint is the suspension bottoming and not only a noise.

Does the suspension bottom abnormally easy when the vehicle is driven over bumps?

--

Go to Step 2

System OK

2

  1. Check for vehicle overloading. Refer to Tire Placard in General Information.
  2. If necessary, remove the excess weight from the vehicle.
  3. Road test the vehicle in order to verify the customer complaint.

Does the suspension bottom abnormally easy when the vehicle is driven over bumps?

--

Go to Step 3

System OK

3

Inspect the vehicle trim height. Refer to Trim Height Specifications in Suspension General Diagnosis. Repair as necessary.

Has the inspection/repair been performed?

--

Go to Step 1

System OK